Even though testers and developers use Debug mode, I say that its fun if you wanna do somthing thats not your level. Example : If you wanna do fishing but not high enough level (like 25), Debug mode is great. + this to keep it alive.
Spike factory is a good defense tower. It lets you get to Plant spikes for FREE! But the price... erm.. ya... 595 for easy well... thats ok but change the price Ninjakiwi! 5/5 :]